Today we're launching add-ons—new tools created by developer partners that give you even more features in your documents and spreadsheets to scheduled release domains. To browse through add-ons for Docs and Sheets, select Get add-ons in the Add-ons menu of any open document or spreadsheet. Once you install an add-on it will become available across all of your documents or spreadsheets and you can start using it right away. Note that add-ons for spreadsheets are only available in the new Google Sheets.

Google Apps admins have had the option to disable add-ons through Drive settings in the Admin console for the past few weeks. Users will always see the Add-ons menu and can browse them but will not be able to install them if the feature is disabled by the admin.

Release Track:
Scheduled release

Editions included: 
Google Apps for Business, Education and Government

For more information:
https://support.google.com/a/answer/4530135
http://googleenterprise.blogspot.com/2014/03/bring-little-something-extra-to-docs.html
whatsnew.googleapps.com
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